JP6923373B2 - Content playback device and content playback method - Google Patents

Description

The disclosed embodiments relate to content reproduction devices and content reproduction methods.

Conventionally, a content reproduction device for reproducing contents such as music stored in an external device such as a smartphone has been known.

In such a content playback device, for example, when the user accepts a track UP / DOWN operation of designating a desired track relative position to a track (music) currently being played and selecting a song, the track number currently being played is used. The track UP / DOWN command is transmitted to the external device as many times as necessary up to the track number of the desired song (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-191111

However, the above-mentioned prior art has room for further improvement in suppressing deterioration of the response when the track UP / DOWN operation is accepted.

Specifically, in the above-mentioned conventional technique, when the track UP / DOWN operation is accepted, the number of times required to transmit the track UP / DOWN command depends on the difference between the track number currently being played and the track number of the desired song. There is a risk that the response will be deteriorated by putting a load on the external device side that receives this.

The track UP / DOWN operation can be rephrased as a content switching operation.

One aspect of the embodiment is made in view of the above, and an object of the present invention is to provide a content reproduction device and a content reproduction method capable of suppressing deterioration of a response when a content switching operation is accepted. do.

The content reproduction device according to one aspect of the embodiment is a content reproduction device capable of reproducing the content stored in the external device, and includes an acquisition unit and a generation unit. The acquisition unit acquires list information including the reproduction order of the contents from the external device. The generating unit, when receiving the operation of switching the content to be reproduced, the specified directly depending prior Symbol list information already acquired all mules, the content to be next reproduced to the operation amount of the operation generates a first command transmitted to the external device, if not acquired the list information, the number of times generating a second command to switch one by one the content along the reproduction order corresponding to the operation amount Then, it is transmitted to the external device.

According to one aspect of the embodiment, it is possible to suppress deterioration of the response when the content switching operation is accepted.

FIG. 1A is a schematic configuration diagram of a navigation device including the content playback device according to the embodiment. FIG. 1B is a schematic explanatory view of a content reproduction method according to a comparative example. FIG. 1C is a schematic explanatory view of a content reproduction method according to an embodiment. FIG. 2 is a block diagram of the navigation device according to the embodiment. FIG. 3A is a diagram (No. 1) showing a specific example of the track UP / DOWN operation. FIG. 3B is a diagram (No. 2) showing a specific example of the track UP / DOWN operation. FIG. 3C is a diagram (No. 3) showing a specific example of the track UP / DOWN operation. FIG. 4 is a diagram showing an example of list information. FIG. 5A is a process explanatory diagram (No. 1) of the request generation process. FIG. 5B is a process explanatory diagram (No. 2) of the request generation process. FIG. 5C is a process explanatory diagram (No. 3) of the request generation process. FIG. 6 is a diagram showing a processing sequence of the content reproduction device and the external device. FIG. 7 is a flowchart showing a processing procedure executed by the content playback device according to the embodiment.

Hereinafter, embodiments of the content reproduction device and the content reproduction method disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

Further, in the following, after explaining the outline of the content reproduction method according to the present embodiment with reference to FIGS. 1A to 1C, the content reproduction apparatus 10 to which the content reproduction method according to the present embodiment is applied will be described with reference to FIGS. 2 to 7. Will be explained using.

Further, in the following, a case where the content reproduction device 10 is mounted on a car navigation device (hereinafter, referred to as “navigation device 1”) will be described as an example. Further, in the following, a case where the content reproduced by the content reproduction device 10 is a track (musical piece) will be described as an example.

First, the outline of the content reproduction method according to the present embodiment will be described with reference to FIGS. 1A to 1C. FIG. 1A is a schematic configuration diagram of a navigation device 1 including a content playback device 10 according to the present embodiment. Further, FIG. 1B is a schematic explanatory view of a content reproduction method according to a comparative example. Further, FIG. 1C is a schematic explanatory view of the content reproduction method according to the present embodiment.

As shown in FIG. 1A, the navigation device 1 according to the present embodiment includes a content reproduction device 10, an operation unit 20, and a display unit 30. The content reproduction device 10 is connected to an external device 100 such as a smartphone so as to be able to communicate with each other using, for example, Bluetooth (Bluetooth: registered trademark), and the content 102b stored in the external device 100 is reproducibly provided. The track to be reproduced is output from an output unit 40 such as an in-vehicle speaker.

The operation unit 20 is a user interface for the user to give an operation to the content reproduction device 10, and includes, for example, a dial unit 21 provided so as to be rotatable. The user can perform a track UP / DOWN operation for selecting a desired track by rotating the dial unit 21 by an arbitrary amount and designating a relative position in the reproduction order from the track currently being reproduced.

The display unit 30 is a display device of the navigation device 1, and during track reproduction of the external device 100 via the content reproduction device 10, for example, as shown in FIG. 1A, the track number and track name being reproduced (here, the track name and track name). "○ ×") can be displayed. In addition, the display unit 30 can, of course, display car navigation information during vehicle route guidance.

By the way, in such a navigation device 1, a continuous track UP / DOWN operation may be accepted from the user. For example, the user desires a track whose relative position is far from the track currently being reproduced, and the user rotates the dial unit 21 significantly so that the reproduction position skips to the beginning of the desired track at once.

In such a case, as shown in FIG. 1B, in the content reproduction method according to the comparative example, the content reproduction device 10'accepts continuous track UP / DOWN operations (step S1') and derives the operation amount (step S1'). S2'). The operation amount is, for example, the rotation amount of the dial unit 21.

The operation amount corresponds to the skip amount for one track in a predetermined unit, and the content reproduction device 10'leads the external device 100 to the track UP / DOWN command for switching tracks one by one according to the reproduction order. The command is transmitted as many times as necessary according to the amount of operations performed (step S3').

However, if the number of commands transmitted here is large, the external device 100 is overloaded by the number of commands, the behavior of the external device 100 becomes heavy, and the response until the start of playback may deteriorate (event). E1).

Some external devices 100 can notify the content playback device 10'of list information including the playback order and track number of the music currently being played.

Therefore, as shown in FIG. 1C, in the content reproduction method according to the present embodiment, when the content reproduction device 10 receives the notification of the list information, if the continuous track UP / DOWN operation is accepted ( In step S1), after deriving the operation amount (step S2), it was decided to derive the directly designated track number based on the operation amount (step S3).

Then, a command for directly designating the derived track number is generated and transmitted to the external device 100 (step S4). As a result, the number of commands received by the external device 100 can be reduced, so that even when a continuous track UP / DOWN operation is accepted, it is possible to suppress deterioration of the response until the start of playback. Can be done.

However, the list information is obtained at the time when the content playback device 10 accepts the continuous track UP / DOWN operation immediately after the external device 100 and the content playback device 10 are communicated and connected, or when the load of the external device 100 is high. May be unannounced.

Therefore, as shown in FIG. 1C, in the content reproduction method according to the present embodiment, when the list information is not notified, the track UP / DOWN command is transmitted as many times as necessary until the list information is notified. It was decided (step S5). Then, when the external device 100 notifies the list information, steps S3 and S4 are executed based on the list information, and a command for directly designating the track number is transmitted to the external device 100.

As a result, even if the list information from the external device 100 is not notified, the function for continuous track UP / DOWN operation is prevented from being impaired, and after the list information is notified, until the start of playback. It is possible to suppress the deterioration of the response of.

Hereinafter, the content reproduction device 10 to which the content reproduction method according to the present embodiment described above is applied and the navigation device 1 provided with the content reproduction device 10 will be described more specifically.

FIG. 2 is a block diagram of the navigation device 1 according to the present embodiment. Note that, in FIG. 2, only the components necessary for explaining the features of the present embodiment are represented by functional blocks, and the description of general components is omitted.

In other words, each component shown in FIG. 2 is a functional concept and does not necessarily have to be physically configured as shown in the figure. For example, the specific form of distribution / integration of each functional block is not limited to the one shown in the figure, and all or part of the functional blocks are functionally or physically distributed in arbitrary units according to various loads and usage conditions. -It is possible to integrate and configure.

As shown in FIG. 1A, as shown in FIG. 2, the navigation device 1 includes a content reproduction device 10, an operation unit 20, and an output unit 40. In FIG. 2, the display unit 30 (see FIG. 1A) is not shown.

An external device 100 is connected to the content playback device 10 so as to be able to communicate with each other. The connection form between the content reproduction device 10 and the external device 100 may be wired or wireless, and the connection form may be such that the external device 100 is directly attached to the connection slot of the content reproduction device 10.

The description will be given from the external device 100 side. The external device 100 includes a control unit 101, a storage unit 102, and a communication unit 103. The control unit 101 includes a reproduction request processing unit 101a.

The storage unit 102 is a storage device such as a non-volatile memory or a register, and stores the list information 102a and the content 102b. The list information 102a is information including the reproduction order and the track number of the track currently being reproduced. An example thereof will be described later with reference to FIG. The content 102b is a group of contents stored in the external device 100, and each track is stored in the present embodiment.

The communication unit 103 is a communication device, and transmits / receives data between the external device 100 and the content reproduction device 10.

The control unit 101 controls the entire external device 100. The reproduction request processing unit 101a switches the reproduced tracks one by one in the front-rear direction according to the reproduction order in response to a request regarding content reproduction from the content reproduction device 10 via the communication unit 103, for example, a track UP / DOWN command. Or, for a command that directly specifies a track number, processing such as finding the track corresponding to the track number is performed.

Further, the reproduction request processing unit 101a notifies the content reproduction device 10 of the list information 102a via the communication unit 103. Further, the reproduction request processing unit 101a reproduces the designated track, and outputs the reproduction signal to the content reproduction device 10 via the communication unit 103.

Next, the content reproduction device 10 side will be described. The content reproduction device 10 includes a control unit 11, a storage unit 12, and a communication unit 13. The control unit 11 includes a reception unit 11a, an acquisition unit 11b, a request generation unit 11c, and a reproduction unit 11d.

The storage unit 12 is a storage device such as a hard disk drive, a non-volatile memory, or a register, and stores the list information 12a. The list information 12a is information for the list information 102a of the external device 100.

The communication unit 13 is a communication device and transmits / receives data between the content reproduction device 10 and the external device 100.

The control unit 11 controls the entire content reproduction device 10. The reception unit 11a receives an operation from the user via the operation unit 20, for example, a continuous track UP / DOWN operation. In addition, the reception unit 11a notifies the request generation unit 11c of the received operation content.

Here, a specific example of the track UP / DOWN operation will be described with reference to FIGS. 3A to 3C. 3A to 3C are diagrams (No. 1) to (No. 3) showing specific examples of the track UP / DOWN operation.

As shown in FIG. 3A, the track UP / DOWN operation can be performed by the dial unit 21 provided so as to be rotatable. Here, as shown in FIG. 3A, when the dial portion 21 is rotated on the (+) side, that is, clockwise, the track is moved up from the currently playing track in the playback order. do. On the contrary, when the dial portion 21 is rotated on the (−) side, that is, counterclockwise, the track is moved down from the currently being reproduced track in the reproduction order.

When such a dial unit 21 is used, the rotation amount, which is the operation amount thereof, is associated with the skip amount of the track in advance for each predetermined angle, for example. For example, in the example shown in FIG. 3A, the rotation amount “-30 deg” is associated with the skip amount “-2 track”.

That is, in this case, if the dial unit 21 is rotated by "-30 deg" to the (-) side, the track to be played is moved down by "-2 tracks" from the currently playing track, that is, the playback order is moved down by two songs. It will be possible to switch to a new truck.

In this way, for example, the rotation amount "-15 deg" becomes the skip amount "-1 track", the rotation amount "+15 deg" becomes the skip amount "+1 track", and the rotation amount "+30 deg" becomes the skip amount "+2 track". Each is associated. Note that this is just an example, and does not limit the amount of rotation corresponding to the skip amount for one track.

Further, as shown in FIG. 3B, the track UP / DOWN operation can also be performed by the pressing portion 22 provided so that the pressing operation can be performed. Here, as shown in FIG. 3B, when the button 22a on the (+) side is pressed, the track is assumed to move up from the currently being reproduced track in the reproduction order. On the contrary, when the button 22b on the (−) side is pressed, the track is moved down from the currently playing track in the playback order.

When such a pressing unit 22 is used, the number of continuous pressings, which is an example of the operation amount, is associated with the skip amount of the track in advance, for example, every predetermined number of times. For example, in the example shown in FIG. 3B, the number of continuous pressing "-2 times" is associated with the skip amount "-2 tracks".

That is, in this case, if the button 22b is pressed twice in succession, the track to be reproduced is switched from the track currently being reproduced to the track carried down by "-2 tracks".

In this way, for example, the number of continuous presses "-1 time" is the skip amount "-1 track", the number of continuous presses "+1 time" is the skip amount "+1 track", and the number of continuous presses "+2 times" is the skip amount. Each is associated with "+2 track". In addition, although the operation amount using the pressing portion 22 is defined as the number of continuous pressings here, it may be, for example, the pressing time.

Further, in FIG. 3B, an example in which the buttons 22a and 22b are provided as the pressing portion 22 is given. However, as shown in FIG. 3C, for example, the dial portion 21 is not only rotated, but also on the (+) side or the (-) side. After enabling the slide operation, the number of slides and the slide holding time may be handled in the same manner as the number of continuous pressings and the pressing time in the example of FIG. 3B.

As a result, it is possible to perform various operations including, for example, a track UP / DOWN operation with only one dial unit 21 without increasing the arrangement space of the operation unit 20.

Returning to the description of FIG. 2, the acquisition unit 11b will be described subsequently. The acquisition unit 11b acquires the list information 102a from the external device 100 via the communication unit 13 and stores it in the storage unit 12 as the list information 12a. Here, an example of the list information 12a will be shown. FIG. 4 is a diagram showing an example of list information 12a.

As shown in FIG. 4, the list information 12a includes, for example, a "reproduction order" item, a "track number" item, and a "track name" item. If the tracks are not switched, the tracks will be reproduced in order according to the "reproduction order" of the list information 12a.

In FIG. 4, the stored values of the "reproduction order" item and the "track number" item are set to the same value, but the stored values are not limited. Further, for example, the stored values of the "track number" item do not have to be in the sequential order as shown in FIG. For example, in the case of random playback, the "track numbers" may be in random order.

Returning to the description of FIG. 2, the request generation unit 11c will be described subsequently. The request generation unit 11c refers to the storage unit 12 when, for example, a continuous track UP / DOWN operation is received by the reception unit 11a.

Here, if the list information 12a has been acquired by the acquisition unit 11b, the request generation unit 11c directly specifies the track to be played next according to the operation amount of the track UP / DOWN operation (hereinafter, the command). A "first command") is generated and transmitted to the external device 100 via the communication unit 13.

On the other hand, if the list information 12a has not been acquired by the acquisition unit 11b, the request generation unit 11c describes a command (hereinafter, referred to as "second command") for switching tracks one by one according to the reproduction order in one transmission. ) Is generated and transmitted to the external device 100 via the communication unit 13 for the number of times according to the operation amount of the track UP / DOWN operation.

If the list information 12a has been acquired by the acquisition unit 11b during the transmission of the second command, the request generation unit 11c generates the first command based on the list information 12a and the operation amount. , Transmit to the external device 100.

In other words, the request generation unit 11c transmits a second command based on the operation amount until the list information 12a has been acquired, and after the list information 12a has been acquired, the above The first command is sent based on the amount of operation.

Here, the request generation process by the request generation unit 11c will be described more specifically with reference to FIGS. 5A to 6. 5A to 5C are process explanatory views (No. 1) to (No. 3) of the request generation process. Further, FIG. 6 is a diagram showing a processing sequence of the content reproduction device 10 and the external device 100. Here, it is assumed that the track UP / DOWN operation is performed by the rotation operation of the dial unit 21.

As shown in FIG. 5A, first, the request generation unit 11c derives the rotation amount from the track UP / DOWN operation received by the reception unit 11a (step S51). Here, it is assumed that the amount of rotation is "+75 deg" as an example.

Then, the request generation unit 11c converts the derived rotation amount into the skip amount of the reproduction order (step S52). For example, according to the regularity of the 15 deg interval of the correspondence between the "rotation amount" and the "skip amount" shown in FIG. 3A, the rotation amount "+75 deg" is converted to the skip amount "+5 track" here. ..

Therefore, as shown in FIG. 5A, when the track of the reproduction order "2" and the track number "2" is currently "playing", the "skip destination" is the reproduction order "7" and the track number "7". It becomes a truck.

When the list information 12a has been acquired by the acquisition unit 11b, the request generation unit 11c can derive the track number "7", so that the request generation unit 11c can perform the skip destination corresponding to the skip amount. The first command for directly specifying the track number will be generated (step S53).

Here, as a modification, consider a case where a skip amount exceeding the skip destination included in the list information 12a is derived. For example, as shown in FIG. 5B, it is assumed that the acquired list information 12a is for 10 tracks, but the skip amount converted from the rotation amount of the dial unit 21 is “+36 tracks”.

In such a case, the request generation unit 11c sets, for example, the remainder when the skip amount is divided by the number of list information 12a, that is, the remainder "6" of 36/10 as the skip amount (step S54). Therefore, as shown in FIG. 5B, when the track of the reproduction order "2" and the track number "2" is currently "reproducing", the "skip destination" becomes the track of the reproduction order "8". As a result, even when the operation amount exceeding the number of the list information 12a is received, it is possible to prevent the function for the track UP / DOWN operation from being impaired.

On the other hand, when the list information 12a has been acquired by the acquisition unit 11b and the list information 12a has not been acquired, the request generation unit 11c first starts from the track UP / DOWN operation as shown in FIG. 5C. The derived rotation amount is converted into a skip amount (step S52). Up to this point, the same as in the case of FIG. 5A.

However, here, as shown in FIG. 5C, when the list information 12a is not acquired (event E2), the request generation unit 11c cannot derive the track number “7” which is the “skip destination”. .. Therefore, in this case, the request generation unit 11c generates five second commands (step S55) for skipping tracks one by one in the playback order from the current “playing”, and sequentially generates the external device 100. Will be sent to.

As a result, even when the list information 12a is not acquired, it is possible to prevent the function corresponding to the track UP / DOWN operation from being impaired.

During the transmission of the second command generated in step S55, the request generation unit 11c monitors the acquisition status of the list information 12a, and if the list information 12a has already been acquired, the request generation unit 11c starts from the second command. It is possible to switch to generate the first command and send it to the external device 100.

Such a case will be described with reference to FIG. As shown in FIG. 6, the content reproduction device 10 side accepts the track UP / DOWN operation (step S61), derives the rotation amount (step S62), and converts the derived rotation amount into the skip amount (step S63).

As described above, if the list information 102a has not been notified, that is, the list information 12a has not been acquired, the request generation unit 11c generates a second command as shown in FIG. The list information 102a is transmitted in order (steps S64-1, 64-2 ...), but when the external device 100 notifies the list information 102a before all of the transmissions are completed, the request generation unit 11c sends the list information 102a. The track number directly specified is derived based on (step S65).

At this time, the request generation unit 11c executes step S65 while reflecting the number of times the second command is transmitted. That is, the request generation unit 11c subtracts the number of transmissions of the second command that has been transmitted from the skip amount derived in step S63, and executes step S65 based on the skip amount after the subtraction. As a result, the track currently being reproduced can be synchronized and grasped between the content reproduction device 10 side and the external device 100 side.

Then, the request generation unit 11c generates and transmits the first command based on the track number derived in step S65 (step S66), and the external device 100 side notifies the start of reproduction accordingly. Become.

As a result, even if the list information 102a from the external device 100 is not notified, it is prevented from impairing the function for continuous track UP / DOWN operation, and after the list information 102a is notified, it is played back. It is possible to suppress the deterioration of the response until the start.

Returning to the description of FIG. 2, the reproduction unit 11d will be described subsequently. The reproduction unit 11d receives the reproduction signal of the track from the external device 100 via the communication unit 13, performs equalizer processing and amplification processing set on the content reproduction device 10 side as necessary, and performs the equalizer processing and amplification processing set on the content reproduction device 10 side from the output unit 40. Output. In addition, the reproduction unit 11d can display the track number, track name, and the like of the track currently being reproduced on the display unit 30 (not shown in FIG. 2).

Next, the processing procedure executed by the content reproduction device 10 according to the present embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing a processing procedure executed by the content reproduction device 10 according to the present embodiment. Note that FIG. 7 shows a processing procedure for one track switching operation regardless of whether it is continuous or not. Further, the track switching operation is performed via the dial unit 21 as in the above description.

First, the reception unit 11a accepts the track switching operation (step S101). Then, the request generation unit 11c derives the rotation amount in such an operation (step S102), and converts the derived rotation amount into the skip amount (step S103).

Then, the request generation unit 11c determines whether or not the list information 12a has been acquired by the acquisition unit 11b (step S104). Here, when the list information 12a has already been acquired (step S104, Yes), the request generation unit 11c derives a track number to be directly specified based on the list information 12a (step S105), and specifies such a track number. The first command is generated and transmitted (step S106).

On the other hand, when the list information 12a has not been acquired (step S104, No), the request generation unit 11c generates a second command and transmits it (step S107).

Then, the request generation unit 11c determines whether or not all the second commands have been transmitted (step S108). It should be noted that such a determination may be made every time one second command is transmitted, or every time a predetermined number of commands are transmitted.

When it is determined in step S108 that all the transmissions have been performed (steps S108, Yes), control is transferred to step S109. On the other hand, if it is not determined that all the transmissions have been performed (steps S108, No), the processing from step S104 is repeated.

Then, the reproduction unit 11d reproduces the switched track (step S109), and ends the process.

As described above, the content reproduction device 10 according to the present embodiment is a content reproduction device capable of reproducing a track (corresponding to an example of "content") stored in the external device 100, and includes the acquisition unit 11b and the acquisition unit 11b. It includes a request generation unit 11c (corresponding to an example of the “generation unit”).

The acquisition unit 11b acquires the list information 12a including the reproduction order of the tracks from the external device 100. When the request generation unit 11c receives the operation of switching the track to be played back, if the list information 12a has already been acquired by the acquisition unit 11b, the request generation unit 11c directly sets the next track to be played back according to the operation amount of the operation. The first command to be specified is generated and transmitted to the external device 100.

Therefore, according to the content reproduction device 10 according to the present embodiment, it is possible to suppress deterioration of the response when the track switching operation is accepted.

Further, if the list information 12a has not been acquired by the acquisition unit 11b, the request generation unit 11c generates a second command for switching tracks one by one according to the reproduction order in one transmission, and the operation amount is increased. The second command is transmitted to the external device 100 for the corresponding number of times.

Therefore, according to the content reproduction device 10 according to the present embodiment, even when the list information 12a has not been acquired, it is possible to prevent the function corresponding to the track switching operation from being impaired. As a result, usability can be improved.

Further, the request generation unit 11c transmits a second command based on the operation amount until the list information 12a has been acquired, and after the list information 12a has been acquired, the operation described above. Send the first command based on the quantity.

Therefore, according to the content playback device 10 according to the present embodiment, even when the list information 12a has not been acquired, it is possible to prevent the function corresponding to the track switching operation from being impaired and the list information 12a has been acquired. After that, it is possible to suppress the deterioration of the response until the start of playback of the track. As a result, usability can be improved.

Further, the list information 12a includes a track number corresponding to the reproduction order (corresponding to an example of the "content number"), and the request generation unit 11c converts the operation amount into the skip amount of the reproduction order, and the first command Specify the track number corresponding to the skip amount in.

Therefore, according to the content playback device 10 according to the present embodiment, even when the track switching operation is continuous and the operation amount is large, it is possible to suppress deterioration of the response until the start of track playback. .. As a result, usability can be improved.

Further, a dial unit 21 is provided so as to be rotatable, and the operation amount corresponds to the rotation amount of the dial unit 21.

Therefore, according to the content playback device 10 according to the present embodiment, even if the track desired by the user is far from the track currently being played, the user can intuitively and easily continue the track. The track can be switched. That is, this makes it possible to improve usability.

Further, the pressing portion 22 is provided so that the pressing operation can be performed, and the operation amount corresponds to the number of times of pressing or the pressing time of the pressing portion 22.

Therefore, according to the content reproduction device 10 according to the present embodiment, the user can intuitively and easily perform the continuous track switching operation by the pressing unit 22 as in the case of using the dial unit 21. Can be done. That is, this makes it possible to improve usability. Further, since the dial unit 21 is provided so as to be able to operate as the pressing unit 22, the dial unit 21 does not increase the arrangement space of the operation unit 20, and only one dial unit 21 can be used, for example, various operations including track UP / DOWN operation. Operations can be accepted.

In the above-described embodiment, the case where the content stored in the external device 100 is a track (musical piece) has been described as an example, but any content that can be played back while switching is sufficient, for example, a video. It may be a still image such as a photograph.

Further, in the above-described embodiment, the case where the reproduction signal of the track to be reproduced on the external device 100 side is output on the content reproduction device 10 side is taken as an example, but the data of the track to be reproduced is output to the content reproduction device at the start of reproduction. This may be the case of streaming playback or download playback on the 10 side.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described as described above. Therefore, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

1 Navigation device 10 Content playback device 11b Acquisition unit 11c Request generation unit 12a List information 20 Operation unit 21 Dial unit 22 Pressing unit 22a, 22b Button 30 Display unit 40 Output unit 100 External device

Claims (6)

A content playback device that can play back content stored in an external device.
An acquisition unit that acquires list information including the playback order of the contents from the external device, and
When accepting an operation of switching the content to be reproduced, generating a first command specifying directly depending prior Symbol list information already acquired all mules, the content to be next reproduced to the operation amount of the operation and send to the external device, if not acquired the list information, the second command to switch one of the content and number of times generated corresponding to the operation amount along the reproduction order, the external device A content playback device including a generator for transmitting to. The generator
Until the list information has been acquired, the second command is transmitted based on the manipulated variable, and after the list information has been acquired, the first command is based on the manipulated variable. The content reproduction device according to claim 1 , wherein the command of the above is transmitted. The list information is
Including the content number corresponding to the playback order
The generator
Wherein the operation amount is converted into the skip amount of the reproduction order, the content reproduction apparatus according to claim 1 or 2, characterized in that specifying the content number corresponding to the skip amount in the first command .. Equipped with a dial that can be rotated
The content reproduction device according to claim 1 , 2 or 3 , wherein the operation amount corresponds to a rotation angle of the dial portion. Equipped with a pressing part that can be pressed
The content reproduction device according to any one of claims 1 to 4 , wherein the operation amount corresponds to the number of times of pressing or the pressing time of the pressing portion. A content playback method that can play back content stored in an external device.
An acquisition step of acquiring list information including the playback order of the contents from the external device, and
When accepting an operation of switching the content to be reproduced, generating a first command specifying directly depending prior Symbol list information already acquired all mules, the content to be next reproduced to the operation amount of the operation and send to the external device, if not acquired the list information, the second command to switch one of the content and number of times generated corresponding to the operation amount along the reproduction order, the external device A content reproduction method comprising a generation process of transmitting to.

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